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0. RIESB & H. POHL. I INKING DEVICE FOR PRINTING MACHINES. No. 495,142.

Patented Apr. 11, 1893.

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0. RIESB & H. POI-IL. INKING DEVICE FOR PRINTING MACHINES.

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Patented Apr. 11, 1893.

QM Hermann fihl UNHED STATES PATENT OFFICE.

OSKAR RIESE AND 'HERMANN POHL, OF BERLIN, GERMANY.

INKING DEVICE FOR PRINTING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 495,142, dated April11, 1893.

Application filed March 18, 1892. Serial No. 425,459. (No model.)

To all whom it may concern:

Be it known that we, OsKAR RIESE and HERMANN POHL, both subjects of theKing of Prussia, German Emperor, and residents of Berlin, in the Kingdomof Prussia, German Empire, have invented a new and useful Inking Devicefor Printing-lVIachines, of which the following is a full and exactspecification.

Our invention relates to printing-machines with oscillating platen, andconsists in an inking-device in which the roller taking the ink from thefountain roller is given one complete revolution during the time it isin contact with the same, and in which the fountain roller remains atrest during the time the distributing roller is passing over thedistributing-plate, from which the ink is taken to the types by means ofinking-rollers.

The better to make our meaning clear, we will proceed to describe amachine fitted with our inking-device as represented on the accompanyingdrawings, on which Figure 1 is a side elevation of the machine. Fig. 2is a rear elevation of the same, in the direction of the arrow P inFig. 1. Fig. 3 is an upper view of the same, in the direction of thearrow P in Fig. 1. Figs. 4 and 5 are details showing two differentpositions of the eccentric s and cam disk 5.

Similar letters refer to si milar partsthroughout the several views.

A is the frame of the machine, and a. the driving shaft of the same, onwhich the flywheel is mounted.

a. is the pivot on which the platen oscillates; the platen itself is notshown on the drawings, the bed is fixed to the frame at B. At the upperend of the bed B there is pivoted to the frame the distributing-plate T,and b is the axle to which are secured the arms carrying theinking-rollers,w which are guided over the distributing-plate T and thebed B. The construction of these arms and rollers does not dilfer fromthe usual ones.

Motion is transmitted from the drivingshaft a to the shaft 0 by means oftoothed wheels gearing into another, as indicated by dotted lines inFig. 1. On the shaft 0 there is a crank 2', to the end of which islinked the connecting-rod .2 extending upward, the free end whereof isprovided with teeth, thus forming a rack. These teeth engage with thoseof q firmly mounted on the axle of the fountain 7 roller f, by means ofa spring not shown on the drawings. It will be understood that when theconnecting-rod z descends, it rotates the fountain roller f, as the pawl13 engages with the toothed wheel q; but when the connectingrod ,2 movesupward, the pawl 10 glides over the teeth of the said wheel q, and thefountain roller f is not rotated. The upper end of connecting-rod z isalso guided by means of a roll at pivoted to the frame A.

On the shaft 0 we also mounta cam-shaped disk 3 and at the side of the,same an eccentric 8' (Figs. 1 and 2). The disk 8 is of the form shown inFig. 1, having a semi-circular portion. The cam-disk sis constantly incontact with an upper roll 1' and the eccentric s with a similar lowerone 1". Both rolls 1- and r are secured to the slide G, which is guidedon the shaft 0 by means of the slot 61 and in a guide 6 on the frame A,by means of an extension e. The shape of the cam-disk s and eccentric sis such that the rolls 0" and r are always held exactly the samedistance apart, and constantly rest on the said disk and eccentric, asalready mentioned. To the upper end of the slide G there is linked theconnecting-rod L, which is again linked at 0 to the swinging fork S,pivoted to the frame A at g 9. To the ends of the fork S there aresecured in the usual manner the rods h, fitted with springs h, andreceiving the axle of the distributing-roller Z in hooks provided attheir free ends.

The operation of our improved inking-device is as follows: In Fig. 1 thedistributingroller Z has just reached its highest position, the shaft 0revolving in the direction of the arrow, and said roller Z is therebypressed against the fountain roller f. It will be seen that the latteris already in rotation when the distributing-roller is applied to thesame, as the crank z'and connecting-rodzhave already Before the rotationof the said fountain roller f is stopped, (when the connecting-rod 2begins its upward course,) the eccentric 8 depresses the lower roll 7'and thus moves-the distributing-roller 1 off the fountain roller f, andgradually brings the same into the position shown on Fig. 1 in dottedlines,when the eccentric s, cam-disk 3, rolls 0" and r and shaft 0occupy the position III illustrated by the diagram Fig. 5. During thismovement the inkis distributed-from the distributing-roller Z on thedistribntingplate '1. We have adopted this manner of moving thedistributing-roller l-off the fountain roller f before the rotation ofthe latter is stopped, in order to secure a completely uniformdistribution of the ink on the distributing-roller I, which would beimpossible otherwise. If the distributing roller is allowed to remainincontact iwith thefountain-roller till the rotation of the-latterhasstopped,and is only then removed out of contact with the same, the ink,instead of being uniformly distributed on the surface of thedistributingroller, will. collect at the place of contact when the rollers haveceased to rotate, and thus there will arise an accumulation of ink alongthe said line of .contact. The shaft ccontinuing its rotation,theposit-ion Fig. 1 is soon reached again, and thenthe movements repeatas described.

Itwill be understood that the movements of the distributing-plate T andof the inkingrollers w are such as not to interfere withthat callyeffecting a complete rotation of tl16f01111- tain roller, and means forbringing the distributing roller against the fountain-roller after therotation of the latter has begun, and removing it from the fountainroller before the rotation of the latter is stopped, for the purpose setforth.

2. An inking device for printing machines, consisting essentiallyin thecombination, with a rotatable shaft, of a reciprocating rack and meansfor operating the same from said shaft, a fountain roller and means foreffecting a complete rotation of the same at each downward movement ofthe reciprocating rack, a reciprocating distributing roller and meansfor pressing the same against the fountainroller after the rotation ofthe latter has begun, and removingit from the fountain-roller before therotation of the latter is stopped, and an ink distributing plate toreceive the ink from the distributing roller, substantially as and forthe purpose described.

3. An inking device ,for printing machines, consisting essentially inthe combination, with the rotatable shaft 0, of the crank 2', thereciprocating connecting-rod .2 provided with teeth at its upper end,the fountain rollerf,

the-ratchet-wheel 'm looselymounted on the axle of the same and engagingwith theteeth .of the connecting rod 2, the pawl 19 rigidly connected tosaid ratchet-wheel m, the toothed rollerf and adapted to be rotatedthrough a complete circle bythe pawl 19 at each-downward movement of theconnecting-rod 2, the

cam-disk s, eccentric 3', rolls r and r, slide G having slot (1 andextension e, guide e for the same, connecting-rod L, swinging fork S,rods h, the reciprocating distributing roller Z and distributing plateT; the movements of the OSKAR RIESE. 'HERMANN POHL.

Witnesses:

FR. SPooBINoJ, R. I'IERPICH.

wheel q,'key-ed to the axle of the fountain ICO

